Golang Result.UidMatrix方法代碼示例

// processTask processes the query, accumulates and returns the result.
func processTask(q *task.Query) (*task.Result, error) {
	attr := q.Attr

	useFunc := len(q.SrcFunc) != 0
	var n int
	var tokens []string
	var geoQuery *geo.QueryData
	var err error
	var intersectDest bool
	var ineqValue types.Value
	var ineqValueToken string
	var isGeq, isLeq bool

	if useFunc {
		f := q.SrcFunc[0]
		isGeq = f == "geq"
		isLeq = f == "leq"
		switch {
		case isGeq:
			fallthrough
		case isLeq:
			if len(q.SrcFunc) != 2 {
				return nil, x.Errorf("Function requires 2 arguments, but got %d %v",
					len(q.SrcFunc), q.SrcFunc)
			}
			ineqValue, err = getValue(attr, q.SrcFunc[1])
			if err != nil {
				return nil, err
			}
			// Tokenizing RHS value of inequality.
			ineqTokens, err := posting.IndexTokens(attr, ineqValue)
			if err != nil {
				return nil, err
			}
			if len(ineqTokens) != 1 {
				return nil, x.Errorf("Expected only 1 token but got: %v", ineqTokens)
			}
			ineqValueToken = ineqTokens[0]
			// Get tokens geq / leq ineqValueToken.
			tokens, err = getInequalityTokens(attr, ineqValueToken, isGeq)
			if err != nil {
				return nil, err
			}

		case geo.IsGeoFunc(q.SrcFunc[0]):
			// For geo functions, we get extra information used for filtering.
			tokens, geoQuery, err = geo.GetTokens(q.SrcFunc)
			if err != nil {
				return nil, err
			}

		default:
			tokens, err = getTokens(q.SrcFunc)
			if err != nil {
				return nil, err
			}
			intersectDest = (strings.ToLower(q.SrcFunc[0]) == "allof")
		}
		n = len(tokens)
	} else {
		n = len(q.Uids)
	}

	var out task.Result
	for i := 0; i < n; i++ {
		var key []byte
		if useFunc {
			key = x.IndexKey(attr, tokens[i])
		} else {
			key = x.DataKey(attr, q.Uids[i])
		}
		// Get or create the posting list for an entity, attribute combination.
		pl, decr := posting.GetOrCreate(key)
		defer decr()

		// If a posting list contains a value, we store that or else we store a nil
		// byte so that processing is consistent later.
		vbytes, vtype, err := pl.Value()

		newValue := &task.Value{ValType: uint32(vtype)}
		if err == nil {
			newValue.Val = vbytes
		} else {
			newValue.Val = x.Nilbyte
		}
		out.Values = append(out.Values, newValue)

		if q.DoCount {
			out.Counts = append(out.Counts, uint32(pl.Length(0)))
			// Add an empty UID list to make later processing consistent
			out.UidMatrix = append(out.UidMatrix, &emptyUIDList)
			continue
		}

		// The more usual case: Getting the UIDs.
		opts := posting.ListOptions{
			AfterUID: uint64(q.AfterUid),
		}
		// If we have srcFunc and Uids, it means its a filter. So we intersect.
//.........這裏部分代碼省略.........